[Translation] NOTICE: The following report is an English Translation of the Japanese-language original. This press release is made pursuant to the requirements under the listing rules of, and reported to, the

February 9, 2017

To whom it may concern,

Company name: SUMCO Corporation Representative: Mayuki Hashimoto, Representative Director Chairman & Chief Executive Officer (Code: 3436, TSE First Section) Contact: Hiroshi Shibuya, Executive Officer General Manager of Public Relations & IR Department (Tel: +81-3-5444-3915)

Announcement regarding Planned Change in Other Affiliated Companies

Please be informed that a change in the other affiliated companies of SUMCO Corporation is expected to occur on February 15, 2017. The details are as described below.

1. Reason of the change Notice was received today from & Sumitomo Corporation and Materials Corporation, both of which are the other affiliated companies of SUMCO Corporation, that they plan to sell a part of the common shares of SUMCO Corporation. Accordingly, a change in the other affiliated companies is expected to occur.

2. Overview of shareholders subject to planned change (shareholders which no longer will be the other affiliated companies) (1) Nippon Steel & Sumitomo Metal Corporation (i) Name: Nippon Steel & Sumitomo Metal Corporation (ii) Address: 6-1, 2-chome, Chiyoda-ku, Tokyo Name and title (iii) of President : Kosei Shindo representative: Content of Steelmaking and steel fabrication, Engineering, Chemicals, New (iv) businesses: materials, System solutions (v) Paid-in capital: JPY 419,524 million Date (vi) April 1, 1950 established: Consolidated (vii) JPY 2,854,817 million (as of September 30, 2016) net assets: Consolidated (viii) JPY 6,179,131 million (as of September 30, 2016) total assets: Major shareholders (as Ownership (ix) Name of September percentage 30, 2016): Trustee Services Bank, Ltd. (Trust Account) 4.0% The Master Trust Bank of Japan, Ltd. (Trust 2.7% Account) Nippon Life Insurance Company 2.6% 1.9% Mizuho Bank, Ltd. 1.7% Sumitomo Banking Corporation 1.5% Insurance Company 1.5% The Bank of Tokyo-Mitsubishi UFJ, Ltd. 1.4% THE BANK OF NEW YORK MELLON SA/NV 10 1.3% Japan Trustee Services Bank, Ltd. (Trust Account 7) 1.2% Nippon Steel & Sumitomo Metal Corporation holds 53,933,200 common shares (equivalent to Capital 18.39% of the total number of shares issued and outstanding) of SUMCO Corporation, being the Relationship other affiliated company. between In the directors of SUMCO Corporation, one (x) SUMCO Personnel director is a member of Nippon Steel & Corporation and Sumitomo Metal Corporation. the shareholder: SUMCO Group purchases from the Nippon Steel & Sumitomo Metal Group poly-silicon, the Business principal raw material in the production of transaction silicon wafers, etc. All such transactions are conducted under normal commercial terms.

(2) Corporation (i) Name: Mitsubishi Materials Corporation (ii) Address: 3-2, Otemachi 1-chome, Chiyoda-ku, Tokyo Name and title (iii) of President : Akira Takeuchi representative: Content of Cement, , Advanced Materials & Tools, Electronic Materials (iv) businesses: & Components, Aluminum, Others (v) Paid-in capital: JPY 119,457 million Date (vi) April 1, 1950 established: Consolidated (vii) JPY 632,805 million (as of September 30, 2016) net assets: Consolidated (viii) JPY 1,732,046 million (as of September 30, 2016) total assets: Major shareholders (as Ownership (ix) Name of September percentage 30, 2016): Japan Trustee Services Bank, Ltd. (Trust Account) 6.08% The Master Trust Bank of Japan, Ltd. (Trust 4.21% Account) National Mutual Insurance Federation of Agricultural 2.38% Cooperatives Meiji Yasuda Life Insurance Co. 2.36% MSIP CLIENT SECURITIES 2.30% The Bank of Tokyo-Mitsubishi UFJ, Ltd. 1.87% Mitsubishi Heavy Industries, Ltd. 1.45% Company, Limited 1.32% Japan Trustee Services Bank, Ltd. (Trust Account 7) 1.28% Nippon Life Insurance Company 1.27% Mitsubishi Materials Corporation holds 53,933,200 common shares (equivalent to Capital 18.39% of the total number of shares issued and outstanding) of SUMCO Corporation, being the other affiliated company. Relationship In the directors of SUMCO Corporation, one between Personnel director is a member of Mitsubishi Materials (x) SUMCO Corporation. Corporation and SUMCO Group purchases from the Mitsubishi the shareholder: Materials Group poly-silicon, the principal raw Business material in the production of silicon wafers, and transaction manufacturing equipment for silicon wafers, etc. All such transactions are conducted under normal commercial terms.

3. Number of voting rights and ratio of voting rights held by Nippon Steel & Sumitomo Metal Corporation and Mitsubishi Materials Corporation before and after change (1) Nippon Steel & Sumitomo Metal Corporation Number of voting rights (Ratio of voting rights (Note 1, 2)) Category Through Directly held Total consolidation Before Other affiliated 539,332 0 539,332 change companies (18.39%) (0.00%) (18.39%) After 393,464 0 393,464 ― change (13.42%) (0.00%) (13.42%) (Notes) 1.The ratio is calculated based on the total number of voting rights (2,932,072) after deducting the number of shares without voting rights (78,339 shares) from the total number of shares issued and outstanding (293,285,539 shares) as of December 31, 2016. 2. Ratio of voting rights is rounded off to the second decimal place.

(2) Mitsubishi Materials Corporation Number of voting rights (Ratio of voting rights (Note 1, 2)) Category Through Directly held Total consolidation Before Other affiliated 539,332 0 539,332 change companies (18.39%) (0.00%) (18.39%) After 393,464 0 393,464 ― change (13.42%) (0.00%) (13.42%) (Notes) 1.The ratio is calculated based on the total number of voting rights (2,932,072) after deducting the number of shares without voting rights (78,339 shares) from the total number of shares issued and outstanding (293,285,539 shares) as of December 31, 2016. 2. Ratio of voting rights is rounded off to the second decimal place.

4. Change in non-listed parent companies, etc. that are subject to disclosure Not applicable

5. Outlook There is no impact on the consolidated business performance of SUMCO Corporation as a result of the above change.